Here in Florida Home Owner Associations (HOA) and Condo Owners Association (COA) can be very confusing. In the state of Florida most HOA and COA have the power to put a lien on the property if the homeowner becomes delinquent in paying the monthly dues and/or any special assessments.
There are new laws on the books that place priority on these liens sometime so that they move to the tops and get paid first. I said sometime, you see some court have ruled in favor of the lender who holds a mortgage on said property. In that case the lender has the right to foreclosure on the property again for the amount of the mortgage owed.
So if there is a mortgage on the property you can purchase the HOA/COA lien and still possibly owe the current mortgage. These stories hit the news maybe once a year where the buyer thinks he owns a condo for the $10,000 lien he purchased only to find out the mortgage company is now coming after their money now.
Buyers beware use a professional before investing in something you not 100% sure of. Ask question and don't rush into something you may regret later.